Impeoved expanding mmdeel



laith tats atwt @Hita IMPROVED EXPANDING MANDREL.

l l SPECIFICATION. TO ALL WHOM IT MAY CONCERN:

lleu it known that. I, ISRAEL Bremsen', of New Britain, in the county of Hartford, and State of Connecticut, have invented a new and improved Expanding Mandrel; `and I do hereby declare that the following is a full,

' clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had -to the 'accompanying drawings, forming part of this specication, in which- Figure 1 represents a front viewiof this invention. Figure 2 is a sectional side elevation of the same. Figure 3 is an end view of the mandreh'or arbor, detached. Similar letters of reference indicate like parts. n This invent-ion consists in al tapering mandrel, which is ilattened on three,l or more sides, combination with three or niore'segmental wedges, whichiare tted on the iiattened sides of the mandrel and held in position by a suitable arrangement of a ring and screws in such a manner that by moving said wedges up or down thef mandrel can be adj usted for different-sized holes, and one and the same mandrel can be us'ed forturning a varietyr of articles with di'erent-sized holes.

A represents a mandrel whichris turned tapering from one end to the other, audllattened on three (or more) sides, a. On these flat sides are fitted segmental wedges, `b, which are so shaped that their outer convex surfaces, when they `are Aadjusted. in the proper position on the mandrel, form portions of a cylinder or of a cone, `as

may be desired. Said segmental wedges are held in position on the mandrelV by a. ring, e, provided with a@ series of screws, d, and these screws "are, made to screw into the wedges merely to attach them to the ring. Springs e, under the heads of the screws, render the same yielding, so as to facilitate the entrance of the segmental wedges into the hole previous to driving the, iiattenedtapering mandrel. By :noting the wedges up or down on the mandrel, said mandrelcan be adjusted 'for holcsof different sizes, and pulleys or other articles can be turned on the same, the holes of which varyrfrom one half to one inch.` For instance, a mandrel can be made for one-inch holes up to one and a half inch or more, and another for one and half to two-inch holes, and 9 so forth, whereas with the usual solid mandrels a separate mandrel is required for every sizehole', and these mandrels hate to be turned and iitted Wheneverl the holes vary in the least, whereas my mandrel can be readily l adjusted to the hole, and no time is lost in fitting the mandrel.

What I ola-im as new, and desireto secure by Letters Patent, is-

. 1. The tapering mandrel A, attened on three or more sides, in combination with the segmental wedges 6,1

fitted on the attened sides of the mandrel, substantially as and for the purpose described.

2. The rings c, provided with Vthe screws d, in"combinatio1i with the segmental wedges `b, andmandiel A,

constructed and' operating substantially as and for the purpose described.

" v ISRAEL BEETISON.

i Witnesses:

EDWARD CLARK, STEPHEN NAPHY. 

